From 913d355ec1cf34aad71fdd75202fc3b0309e63a0 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Thu, 28 Jan 2016 20:30:38 +0000
Subject: [PATCH] lots of stuff
---
src/utils.c | 45 +++++++++++++++++++++++++++++++++++++++++----
1 files changed, 41 insertions(+), 4 deletions(-)
diff --git a/src/utils.c b/src/utils.c
index d54e966..ec87a26 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -8,6 +8,29 @@
#include "utils.h"
+void sorta_shuffle(void *arr, size_t n, size_t size, size_t sections)
+{
+ size_t i;
+ for(i = 0; i < sections; ++i){
+ size_t start = n*i/sections;
+ size_t end = n*(i+1)/sections;
+ size_t num = end-start;
+ shuffle(arr+(start*size), num, size);
+ }
+}
+
+void shuffle(void *arr, size_t n, size_t size)
+{
+ size_t i;
+ void *swp = calloc(1, size);
+ for(i = 0; i < n-1; ++i){
+ size_t j = i + rand()/(RAND_MAX / (n-i)+1);
+ memcpy(swp, arr+(j*size), size);
+ memcpy(arr+(j*size), arr+(i*size), size);
+ memcpy(arr+(i*size), swp, size);
+ }
+}
+
void del_arg(int argc, char **argv, int index)
{
int i;
@@ -104,14 +127,13 @@
for(i =0 ; i < M; ++i){
printf("%d ", i+1);
for(j = 0; j < N; ++j){
- printf("%10.6f, ", A[i*N+j]);
+ printf("%2.4f, ", A[i*N+j]);
}
printf("\n");
}
printf("\n");
}
-
char *find_replace(char *str, char *orig, char *rep)
{
static char buffer[4096];
@@ -336,6 +358,21 @@
return sum_array(a,n)/n;
}
+void mean_arrays(float **a, int n, int els, float *avg)
+{
+ int i;
+ int j;
+ memset(avg, 0, els*sizeof(float));
+ for(j = 0; j < n; ++j){
+ for(i = 0; i < els; ++i){
+ avg[i] += a[j][i];
+ }
+ }
+ for(i = 0; i < els; ++i){
+ avg[i] /= n;
+ }
+}
+
float variance_array(float *a, int n)
{
int i;
@@ -447,9 +484,9 @@
}
*/
-float rand_uniform()
+float rand_uniform(float min, float max)
{
- return (float)rand()/RAND_MAX;
+ return ((float)rand()/RAND_MAX * (max - min)) + min;
}
float **one_hot_encode(float *a, int n, int k)
--
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